Coherent system of units
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A coherent system of units is consists consists of a set of base units (typically time, length, mass, electric current and temperature) and a set of derived units. The The derived units are formed from the product of base units raised to specific powers with a constant factor of one. Some derived units have special names.
In SI units, velocity is a derived unit that is measured in metres per second but does not have a special name. On the other hand the the SI unit of energy has the special name "joule". If we consider Albert Einstein's formula E=mc2, then using SI units, the energy E is injoules, the mass m is in kilograms and the speed of light c is in metres per secsecond, it can be seen that one joule is equivalent to one kg.m2/s2.
Coherence can be explained by comparing the curie and the becquerel. The The curie, a non-coherent unit, is equal to 3.7 x 1010 decays per second while the becquerel, a coherent unit, is equivalent to one decay per second.
-<p>A coherent system of units is consists of a set of base units (typically time, length, mass, electric current and temperature) and a set of derived units. The derived units are formed from the product of base units raised to specific powers with a constant factor of one. Some derived units have special names.</p><p>In SI, velocity is a derived unit that measured in metres per second but does not have a special name. On the other hand the the SI unit of energy has the special name "joule". If we consider Einstein's formula E=mc<sup>2</sup>, then using SI units, the energy E is in<a title="joules" href="/articles/joules"> joules</a>, the mass m is in <a title="kilograms" href="/articles/kilograms">kilograms</a> and the speed of light c is in <a title="metres" href="/articles/metres">metres</a> per sec, it can be seen that one joule is equivalent to one kg.m<sup>2</sup>/s<sup>2</sup>.</p><p>Coherence can be explained by comparing the <a title="Curie (unit)" href="/articles/curie-unit">curie</a> and the <a title="Becquerel (SI unit)" href="/articles/becquerel-si-unit">becquerel</a>. The curie, a non-coherent unit, is equal to 3.7 x 10<sup>10</sup> <a title="decays" href="/articles/decays">decays</a> per second while the becquerel, a coherent unit, is equivalent to one decay per second.</p>- +<p>A <strong>coherent system of units</strong> consists of a set of base units (typically time, length, mass, electric current and temperature) and a set of derived units. The derived units are formed from the product of base units raised to specific powers with a constant factor of one. Some derived units have special names.</p><p>In <a href="/articles/international-system-of-units-1">SI units</a>, velocity is a derived unit that is measured in metres per second but does not have a special name. On the other hand the the SI unit of energy has the special name "joule". If we consider Albert Einstein's formula E=mc<sup>2</sup>, then using SI units, the energy E is in<a href="/articles/joules"> </a><a title="Joules (J)" href="/articles/joule">joules</a>, the mass m is in <a href="/articles/kilograms">kilograms</a> and the speed of light c is in <a href="/articles/metres">metres</a> per second, it can be seen that one joule is equivalent to one kg.m<sup>2</sup>/s<sup>2</sup>.</p><p>Coherence can be explained by comparing the <a title="Curie (unit)" href="/articles/curie-unit">curie</a> and the <a title="Becquerel (SI unit)" href="/articles/becquerel-si-unit">becquerel</a>. The curie, a non-coherent unit, is equal to 3.7 x 10<sup>10</sup> <a href="/articles/decays">decays</a> per second while the becquerel, a coherent unit, is equivalent to one decay per second.</p>
References changed:
- 1.International Vocabulary of Metrology – Basic and General Concepts and Associated Terms (VIM 3rd edition) JCGM 200:2012 (JCGM 200:2008 with minor corrections) <a href="https://www.bipm.org/utils/common/documents/jcgm/JCGM_200_2012.pdf">(Read online)</a><span class="ref_v4"></span>
- International Vocabulary of Metrology – Basic and General Concepts and Associated Terms (VIM 3rd edition) (2012) Joint Committee for Guides in Metrology. <a href="https://www.bipm.org/utils/common/documents/jcgm/JCGM_200_2012.pdf">(Read online)</a><span class="ref_v4"></span>
Tags changed:
- si units
Sections changed:
- Imaging Technology
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